I would expect even the best rope or lip rear main seal to leak with 2 quarts of diesel in the crankcase. Drain it and refill the crankcase with oil and climb back under there.


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration